Adding stale issues workflow

[chayim]

Incorporating the stale issues workflow from redis-py. When an issue is greater than one year old, it will be marked as stale. Should any commenter update the issue with a comment, or even an emoji, the issue will be unmarked as stale.

This should allow us to both over time prune older items, while taking into account community needs and engagement.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (93fa07e) 75.36% compared to head (3e34f30) 75.38%.

❗ Current head 3e34f30 differs from pull request most recent head 61f280a. Consider uploading reports for the commit 61f280a to get more accurate results

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3528      +/-   ##
============================================
+ Coverage     75.36%   75.38%   +0.02%     
- Complexity     4894     4895       +1     
============================================
  Files           297      297              
  Lines         14965    14965              
  Branches       1129     1129              
============================================
+ Hits          11279    11282       +3     
+ Misses         3190     3188       -2     
+ Partials        496      495       -1     

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